Brandon Williams, who was chosen by President Trump to oversee the country’s nuclear weapons, stated on Tuesday that he does not recommend resuming explosive testing of deadly weapons.

This statement was made during his Confirmation hearing before the Senate Armed Services Committee, taking many by surprise. While other advisers suggested that the president resume test explosions for national security reasons, the last test in the U.S. occurred in 1992.

Appointed by Trump in January, Williams, a former naval officer from upstate New York, is set to oversee the National Nuclear Security Agency, a semi-autonomous agency within the energy sector responsible for managing the nation’s nuclear weapons complex.

Despite calls from Trump’s allies for a return to testing, one notable figure, former national security advisor Robert C. O’Brien, urged in a magazine article last summer that a new term for Trump would see the resumption of testing to maintain the U.S.’ advantages over China and Russia in nuclear capabilities.

At his confirmation hearing on Tuesday, Williams faced opposition against the resumption of explosive testing, particularly from Senator Jackie Rosen, a Democrat from Nevada, who highlighted the state’s history of nuclear tests during the Cold War.

Describing Nevada as “ground zero” for such testing, Rosen emphasized the harmful impact on the population and environment and vehemently opposed a return to these practices.

Williams responded to questions about advising Trump on explosive nuclear tests, stating his reliance on scientific information and expertise from the NNSA lab’s data and modeling rather than testing.

Concerns about the potential environmental and health impacts of testing in Nevada were also raised, to which Williams acknowledged the importance of considering such factors in decision-making.

With a background in naval service, Williams has been nominated to head the National Nuclear Security Agency and represents New York’s 22nd Congressional District.

In a letter to Williams, Senator Elizabeth Warren expressed concerns about his qualifications in the nuclear field and lack of relevant experience.

During the hearing, Williams stressed the importance of retaining skilled labor at the NNSA, following previous administration changes and workforce challenges.

Praising the agency’s staff, Williams assured senators that he speaks on their behalf and values their expertise.

The Senate Committee is currently evaluating Williams’ nomination, with expectations for approval and confirmation by the full Senate.